body {
  /* background-color: #f7efef; */
}

.demo {
  padding: 2em 0;
  transform: translate3d(0, 0, 0);
}

.navbar {
  width: 150px;
  height: 150px;
  line-height: 150px;
  border-radius: 50%;
  margin: 70px auto;
  position: relative;
  cursor: pointer;
  text-align: center;
  font-size: 1.75em;
  font-weight: bold;
  color: #383838;
  transition: 0.24s 0.2s;
  /* background-color: pink; */

  /* 弹性布局，居中 */
  display: flex;
  justify-content: center;
  align-items: center;

  /* 定位 */
  position: absolute;
  right: 225px;
  bottom: 155px;

  z-index: 99;
}

.navbar:hover {
  background: rgba(255, 255, 255, 0);
}

.navbar .menu {
  list-style: none;
  padding: 0;
  margin: 0;
  position: absolute;
  top: -75px;
  left: -75px;
  border: 150px solid transparent;
  cursor: default;
  border-radius: 50%;
  transform: scale(0);
  transition: transform 1.4s 0.07s;
  z-index: -1;
}

.navbar:hover .menu {
  transition: transform 0.4s 0.08s, z-index 0s 0.5s;
  transform: scale(1);
  z-index: 1;
}

.navbar .menu li {
  position: absolute;
  top: -100px;
  left: -100px;
  transform-origin: 100px 100px;
  transition: all 0.5s 0.1s;
}

.navbar:hover .menu li {
  width: 0;
  height: 0;
  transition: all 0.6s;
}

.navbar .menu li a {
  transition: all 0.4s ease 0s;
  width: 45px;
  height: 45px;
  line-height: 45px;
  border-radius: 50%;
  /* background: blue; */
  position: absolute;
  font-size: 60%;
  color: #99b977;
  transition: 0.6s;
  text-decoration: none;
  z-index: 999;
}

.navbar .menu li a:hover {
  box-shadow: 0 0 0 1px rgba(0, 0, 0, 0.1), 0 2px 4px 1px rgba(0, 0, 0, 0.18);
}

.navbar:hover .menu li:nth-child(1) {
  transition-delay: 0.02s;
  transform: rotate(85deg);
}

.navbar:hover .menu li:nth-child(1) a {
  background-color: #ffffff;
  transition-delay: 0.04s;
  transform: rotate(635deg);
}

.navbar:hover .menu li:nth-child(2) {
  transition-delay: 0.04s;
  transform: rotate(125deg);
}

.navbar:hover .menu li:nth-child(2) a {
  background-color: #2ecc71;
  transition-delay: 0.08s;
  transform: rotate(595deg);
}

.navbar:hover .menu li:nth-child(3) {
  transition-delay: 0.06s;
  transform: rotate(165deg);
}

.navbar:hover .menu li:nth-child(3) a {
  background-color: #3498db;
  transition-delay: 0.12s;
  transform: rotate(555deg);
}

.navbar:hover .menu li:nth-child(4) {
  transition-delay: 0.08s;
  transform: rotate(205deg);
}

.navbar:hover .menu li:nth-child(4) a {
  background-color: #9b59b6;
  transition-delay: 0.16s;
  transform: rotate(515deg);
}

.navbar:hover .menu li:nth-child(5) {
  transition-delay: 0.1s;
  transform: rotate(245deg);
}

.navbar:hover .menu li:nth-child(5) a {
  background-color: #34495e;
  transition-delay: 0.2s;
  transform: rotate(475deg);
}

.navbar:hover .menu li:nth-child(6) {
  transition-delay: 0.12s;
  transform: rotate(285deg);
}

.navbar:hover .menu li:nth-child(6) a {
  background-color: #f1c40f;
  transition-delay: 0.24s;
  transform: rotate(435deg);
}

.navbar:hover .menu li:nth-child(7) {
  transition-delay: 0.14s;
  transform: rotate(325deg);
}

.navbar:hover .menu li:nth-child(7) a {
  background-color: #e67e22;
  transition-delay: 0.28s;
  transform: rotate(395deg);
}

.navbar:hover .menu li:nth-child(8) {
  transition-delay: 0.16s;
  transform: rotate(365deg);
}

.navbar:hover .menu li:nth-child(8) a {
  background-color: #e74c3c;
  transition-delay: 0.32s;
  transform: rotate(355deg);
}

.navbar:hover .menu li:nth-child(9) {
  background-color: blue;
  transition-delay: 0.18s;
  transform: rotate(405deg);
}

.navbar:hover .menu li:nth-child(9) a {
  background-color: #f10fc0;
  transition-delay: 0.36s;
  transform: rotate(315deg);
}
